With one good in season rental week it pretty much pays for itself to have 3% fee all year.  

You can also consider buying materials during off-season sales.Tight Project Management: Keep projects on schedule to avoid costly delays.

Here's some seasoned arbitragers that can help you decide if arbitrage is the right fit.... 

They know they have problems - they've told me as much - but their maintenance manager just grins and bears it as they wait for change because IT controls it all.As a manager of 15+ years, and of at one time nearly 4,000 doors, it appears to me that their current structure is not conducive to the hands-on, seasoned, fast-paced, and decision-driven style you need to be a successful manager.

I am exploring renting my STR to MTR option when the summer travel season dwindles.

However, now that we’re heading into fall, we can see that 2024’s summer selling season was slower than 2023, with closed sales in Austin down around 16% compared to last year.

If the condo can be used for MTRs, can I change rent across rentals in a year depending on seasonality and target segment?

When you have value to offer right away you make better connections with buyers and you need help finding a buyer you can partner on your first couple of deals with a seasoned wholesaler. 

Having a good broker that can tailor the loan to your specific situation is better because they will weed out the lenders that may not go down to your loan amount or may require seasoning of funds or may not allow short term rentals etc...

BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.