For example, here it says:"Go back to the more expensive agents, and tell them the others are offering lower fees.

Not everyone offers STR insurance.

That you wisely build in the costs for replacement linens and towels (also offer black face towels), possibly don't use high-end top-down shades in the Bunk Room (although those black out shades match all the shades in the rest of the house and it's a high-end property), chalk can be brushed, semi-gloss on walls for easier clean-up... and yes, there are clear check-out directions to run the dishwasher provided via an online guest book, a physical guest book, and an email I send regarding check-out the day before they check-out.

What are your suggestions?

I like your idea of offering something that others don't have, for example, office space.

Flash Cards worked for me but like many others suggested already, save the math for last.

I'd highly suggest learning the CT laws and making sure the company you use is completely compliant. 

Could anybody provide me with suggestions for promising investment areas or any other advice?

This might help you get a bit of breathing room to address the bigger maintenance issues you mentioned, like the garage roof and leaning trees.It’s also important to find a support system, whether it’s other landlords who understand what you’re going through or a mentor who can offer advice and encouragement.

Any suggestions on a good quality LVP that will last while also being a good price?