Thanks is too generic, sincerely is too formal, and cheers seems tired.
42+ Too Formal. I joined the bbq = what??? How formal the word is depends mostly on the context you use it in.
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Best regards is the less formal version of the two. 'i as well' is certainly not something anyone english would be likely to use, and 'me too' is the established colloquial way of expressing the thought. Formal abbreviations) there is information about latin abbreviations, which are especially common in quantity words are another area of english that can be expressed both informally and formally.
Generally, what changes are necessary to make something more formal or less formal?
Best regards is the less formal version of the two. In more formal circumstances, thanking someone in advance may come across as too demanding this one's okay if you're sending a formal missive to the potus, but it's too formal for anything else. The construction (too formal a word) is possible since too qualifies the adjective and is directly related to the noun (word). I also think it's too formal you could use something like you have to or you must.
