LONG TERM Plans - LIFETIME Plans !!!
INCREASE length of paid plans AND of course REDUCE pricing.
Currently the longest plan is an expensive 24 months plan. I like Proton, and I am fine to commit for the long term, but I also want PROTON to commit for the long-term with a 5 or 10 year plan, or why not with a lifetime plan, which should of course be much lower cost.
With this approach we users get protected from random price changes, and Proton get a loyal and captive user base, to which it can overtime sell more services.
VOTE for the LONG TERM PLANS Folks!!!

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Marius commented
I'd opt for an affordable plan starting from 1-2€ for Email Plus and gradually increasing to 4€ based on how much storage+folders+emails-per-day I use.