Firstly, everyone has dips in form, literally everyone. Kohli has 70 international hundreds, and yet has averaged about 25 since 2019. It happens to everyone.
As someone who is guilty of massively overthinking, the trick is knowing yourself and what works for you. But most importantly, I think everyone is different. That's the difficulty in working out how to help someone who is out of form. But, most of the time it's all in your head rather than technique. If you were scoring runs at this level the past few years, which it sounds like you were, and nothing has changed physically (ie. your eyesight hasn't got significantly worse over the winter) then it'll be psychological. Unfortunately, sometimes this is harder to solve.
The other thing, based on your post, is that you might not be helping yourself by hitting loads of balls in the nets (especially if it's just a variety of bowling). It sounds counter productive to stop, but it clearly isn't helping and is actually making you feel worse. And it might even be engraining bad habits. So, stop doing it. Try something else. Everyone is different and nets aren't for everyone.
Some things that have worked for me in the past, but only after a lot of trying other stuff which had no impact:
- Focus on one shot you still believe you can hit well and score runs from. For me it's the straight drive. Have throw downs targeting just that shot, don't have throw downs where you're trying to play all around the ground. You'll go out a lot more confident knowing you can just wait for that one shot, and leave the rest. Remember, opening the batting, you should be aiming to bat through for 50 overs. Having one shot only at the start is fine, as long as you're still there to cash in later when you feel better.
- Remind yourself / recreate whatever you were doing last time you hit a big score. What routine did you have? Literally could be anything, I've even gone back to putting a particular album on in the car that I loved at the time I last hit a good score, and it genuinely worked. Like I say though, I am a massive overthinker.
- If in doubt, don't dig yourself a hole. Just deal in singles, don't try and hit it. Plenty of singles in the ring. Similar to first point, just make sure you cash in later down the line.
I have seen teammates play themselves back into form, and it works for them. They go out trying to hit every ball. Personally, it wouldn't work for me. But, everyone is different.