I have a Switch V1 and use VenomNX Overclocking. i boost the CPu up to 1900mhz or 2100mhz. For GPU while it usually sits below 50% utilized you want it around 700mhz or higher, and Ram at 1600 which seems to be a decent configuration, also to limit heat have battery at 100% and charging.
For V1 1750 is a decent OC thats safe with 1900-2100 being the last “safe” Oc settings before getting into heavy OCs. Charger recommended. If it stays below 54-55C youre fine, if it goes above 58-59C repaste switch, clean vents, have in cooler ambient environment. Or go down clocks
For switch lite youll get better OCing experience and boost higher but just need a charger.
Both V1 and Lite recommended to use charger