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how to make my left hand finger stronger

Personally, finger independence goes a long way to offset strength(strength will develop anyway). When your fingers are not in competition they can more easily fret the strings. Fret skipping and progressive string skipping permutations are what I use(the Spider is a well known example, but I've gone a lot further with stuff I've come up with). Often I prefer to use a guitar to do this. Starting out, the smaller increments are easier to cope with. Playing chords/chord switching is a good way to gauge progress.

This probably isn't always true but if your fingers fly way off the fretboard while you play, you probably could use this. In general an economy of motion is worth having.

Also, this article worked wonders for my hands and perspective. I had got to where I struggled to pick things up. Every since I started applying the information 10+ years ago I have not had any thing remotely similar. I've used it as a basis for injury/difficulties involving of areas of my body...ie lower back.

The main takeaway for me was:

1) The value of a well placed stretch. Try as your body may to help, it does not always succeed. It needs your help, but it needs to be well targeted.

2) Be regularly moderate, not infrequently aggressive.

BERKLEE | Berklee Today

YMMV
 
Just for a little perspective, it takes about 3 or 4 ounces of pressure to fret a note, which is about how much a brand-new roll of electrical tape weighs. Can you hang a roll of tape from your finger, and raise and lower it a few dozen times? If so, you have all the strength you need.