1. The purpose of travel wasn't strong. If even that is it you can now, while reapplying, provide a day by day itinerary and reserved air tickets and hotel booking (not purchased yet).
2. The person you intend to visit needs to give you an invitation letter stating you'll stay with them and they would provide their proof of residence also (if you're not including hotel details). And may also state you and invitees will share your expense in Canada.
3. For "so no intention to go there and start fresh" maybe you don't but there are people who do and have done in past, so you need to have clear documents so that VO would not think you do too. That's why you'd need to have a strong purpose of travel. The second reason of rejection (Due to limited opportunity of employment prospect in your residence country), only came into picture as the purpose (to travel and spend thousands of dollars) wasn't strong.
4. You can reapply anytime, if it does not state otherwise in your refusal letter, after working on refusal reasons. Also include a cover letter .