I think $4.585 is a perfect long-term buy zone. Dot has a monthly rangetrend that supports the upward move and some levels.
1st target - would be in the area of monthly resistance at the price of $7.42 - almost 60% profit.
2nd target - would be in the area of weekly resistance at the price of $8.54 - almost 85% profit.
If the Polkadot price never reaches this weekly support, you can buy at $5.55 for 30-40% of your budget, and if the price drops to $4.585, you can buy the rest.