Hi FFC:
I presume you mean you just reserved Week 30, July 24/25/26, for 2020.
Within Interval, your deposit has a life of 2 years. You will have until late July 2022 to travel.
Your trade power is determined by your resort's rating (Premier!), unit size, and Travel Demand Index (TDI) for the week you deposited. Week 30's TDI is slightly above average at 120. The scale is at the bottom of the grid, between 50 (lowest) and 150 (highest). You typically want to reserve the week with the highest TDI in your season, and/or a holiday week.
Some timeshare systems are allowed to Request First, which allows the member to keep the week outside of Interval until a match is found; others must deposit their week into Interval to set up an ongoing search request.
Go to the Resort Directory, and jot down the 3-digit resort codes of the resorts that appeal to you. (e.g. MMB, MUZ, MEM)
Go to Exchange > Vacation Exchange > My Units
Next to each unit you have available to trade, there is a "Vacation Exchange" button. Select that, and you may search online to see what's out there right now. In the rare instance that the exact resort and date you want is available, you may confirm it online.
More likely, you will need to "Place Request". You select the unit size on the front screen. Leave the number of adults/children at 1/0.
Continue.
Enter each resort code, when the correct resort name appears, select it.
Enter the date range during which you wish to travel.
Continue, Continue....until you get to the payment screen.
You pay the "exchange fee" of $209 to set up the ongoing search. Then Interval's system begins searching for you 24 x 7.
When do you wish to travel?
Spain is your best bet, as Phyllis described. The Marriotts get lots and lots of deposits; each of the three resorts has about 100 units available online right now. The only difficulty is if you want a prime summer week. Then, you are competing with a lot of other members.
Interval has very little in Eastern Europe. Turkey has 2 resorts with inventory. Croatia only has 1 resort with 1 week currently online. Greece has 1 resort currently online, but it's all-inclusive. There is another code for that resort which is regular (RIM). Read the reviews, and include it in your search if it appeals to you.