think about something that you like in your community. Is there anything that you could do to improve on it? for example- "I really enjoy going for walks in my local park, but I wish there were more flowers around." To help something like this, you could volunteer your time to plant more flowers in the park.
For this example the first thing you would want to do is contact the owner of the property, such as the city office. You can call, or send an E-Mail to ask for permission to do your project, and find out about any issues or suggestions they might have for the project, along with any permits they may need.
After you have gotten permission from where you want your project to take place, you will need to formulate a plan. you will want to think about all of the work you need to do such as, selecting what flowers you want to plant,purchasing the seeds, preparing the ground to plant, planting the seeds, watering them, and continuing to come back and water the flowers as they grow.
Think of ways you could potentially incorporate other people into this project, such as people to help dig holes for flower seeds, to help water, and to help monitor growth and take care of the flowers. Once you have jobs planned out, you can start asking family or friends if they would like ot help, or even reach out in online groups, or create flyers to hang up for people who may be interested to come help.