Advice on getting into gold

Okay so last season I managed to get into Gold 2, it was for me really hard, and I struggled a lot, I ended up falling down to silver but finished the season in Gold 5. Now since this new season started, a lot of things changed but as of now I feel confident in playing again, I almost got my solo q rank into gold but tilted and fell to S3 Now I find solo q incredibly toxic, and honestly I've learnt a lot more things in flex than I ever did into solo Q to be honest. The problem is, when ever I am around 90 lp with one more game to go, I end up tilting and falling down to 20lp It's mostly because I get too nervous and people start telling me im boosted, any advice?
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