Since you ask what practitioner of religion say about this issue then I will say my belief in this.
I also hope Christians will consider this before committing such sinful action.
So while there is nothing in the bible about where people die when they suicide, we get the idea that killing ourselves meaning we commit murder. There will be consequences in that action in front of God’s judgement. We will be held accountable.
God doesn't have to dictate everything, we are not supposed to eat spiritual baby food forever. Our faith must grow mature but we stay meek in front of God, just like how Jesus Himself was meek.
There are people who committed suicide in the bible, none of them are God's people. I mean, one of em is Judas, you know.
Now, there are plenty of God's people, famous prophets, that dealt with great pain, troubles, and sorrow. None of them suicide.
In Jonah 4:8 Jonah said it's better for me to die than to live. (which later he was rebuked by God for saying such thing)
In 2 Corinthians 1:8 Paul the apostle says "...that we were pressed out of measure, above strength, insomuch that we despaired even of life". In ESV it was "beyond our strength."
In Ecclesiastes 2:17 Solomon, he said he hated life but later on in Ecclesiastes 12:13 he spoke what matters the most.
In 1 Kings 19:4 In the wilderness Elijah was so depressed he asked God just pls God, take my life.
Also read Job 2:9-10 what Job's wife said to him, “'Do you still hold fast your integrity? Curse God and die!' But he said to her, 'You speak as one of the foolish women speaks. Shall we indeed accept good from God and not accept adversity?' In all this Job did not sin with his lips,”
Imagine if there was someone like Job in our modern days, if he committed suicide people would justify it that it was too much for a man to live in that kind of situation. But Job didn't, and God, I'm pretty sure also did not want that. God wants our faith in Him and He is glorified in our faithfulness.
Life is about struggles, it is what it is. These prophets experienced painful things that beyond what we could ever think of.
In the next verse Paul says this:
2 Corinthias 1:9 "But we had the sentence of death in ourselves, that we should not trust in ourselves, but in God which raiseth the dead"
I know the future of me will face a lot of troubles and even serious health problems but God gives and God takes, we live to glorify Him and bible is full of hope, peacefulness, joy, and promises.
Romans 8:18 For I reckon that the sufferings of this present time are not worthy to be compared with the glory which shall be revealed in us.
About Euthanasia, the same as suicide. When the time comes, we will go naturally.
If our loved one, in a terminal illness, great pain and there is nothing can help them anymore, give them comfort and stay with them until death naturally takes its course as I believe it is God's time to take them back. So we don't take the matter life and death into our own hands.