upgrade theme and plugins

i would like to ask you about upgrading the theme into the new version without having troubles or problem on the website , when I do an upgrade all the website and design changing and I can’t control the change but when I keep it up as it is everything be fine , so could you please to upgrade some essential plugins that effects on website like (TruSmile Framework , Slider Revolution , Classic Editor ).
in addition I have got some bugs and problem in website and I want to upgrade PHP versing into 8.1 but I can’t because of some technical issues and un-updated plugin so kindly could you please to update all plugins that i have mentioned without any destroying on design or anything on website

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