These shares are a long-term investment. They are not freely tradeable, so there is no market valuation for them at the moment. They remain with the crowdfunders (unless transferred with permission of the administrators) until the next investment round, where it is up to investors to determine how much Fairphone is worth.
You should check the financial reports to know how your investment is doing, you get them every half year if you are a shareholder. They can’t be disclosed publicly, but from page 32 of the 2021 impact report, as well as the sales statistics, you can get an idea how FP has grown since the crowdfunding in 2018.
At the moment, Fairphone invests profits back into the company instead of paying out dividends (as shareholder, you should be able to find more details in the financial report that you receive every half year.)