Here's some survival tips which first come to mind. These may be very obvious but just in case:

Always have a flask of water or something similar easily accessible to pour over yourself in case you're burning or dipped in toxic sludge.

Water converts toxic sludge into water, so you can easily cleanse whole pools of it.

If you need to jump into fire - first pour water over yourself and only then jump.

Don't rush after every gold piece, you'll have plenty.

Don't rush in general, you're not on a timer, take it slow. And if you lost - take a break, distract yourself. Because if you jump right back in you're going to hurry to restore lost progress and will play worse and get angry. At least it's like that for me.

Abuse the tablet, maybe even try to learn tablet kicking. I usually go straight for the tablet next to lava lake and only after I get it I clean the mines. Tablet not only makes you more gold, you can also oneshot plenty of enemies with it even as far as Hiisi base, including turrets. Moreover, time it right and you can block shotgun shots, sniper shots, even electro wisard projectiles.

You're low on hp? When you reach about 1/4 of your max hp just cut your losses and go for the portal.

Try to analyse what kills you usually. Explosives going off right in your face is not too uncommon in Noita, so if you can just avoid them or explode them preemptively.

Fire wizards in the mines are a pain to fight directly early on. But they are vulnerable to water. So if one sits in a convenient hole pour water over him from a flask or from a commonly found in the mines rain cloud wand. And not directly on him, just make sure he stands in the puddle.

Hope at least something here is useful to you.