make sure the sunscreen you are using is broad spectrum meaning it provides adequate protection against both UVA and UVB rays. Check the packaging for a list of active ingredients including Titanium Dioxide, avobenzone, zinc oxide, mexoryl sx.
There is absolutely no point in wearing a sunscreen if it doesnt protect against both UVA and UVB rays.. regardless of how high the SPF may be.
Sun Protection Factor is only an indication of how well it protects against UVB rays (the ones that cause only a shortterm effect of sunburn) and it says nothing about UVA rays (the real horrible stuff which damages DNA and leads to permanent damage).